In Iowa farming is rapidly becoming more mechanized and less labor-intensive. As a result, fewer households are supported by farming, and more households are supported indirectly by farm-related businesses.
Barnard, Jerald R. and Maki, Willbur R.
"Iowa's Economy in 1974,"
Iowa Farm Science: Vol. 20
, Article 3.
Available at: https://lib.dr.iastate.edu/farmscience/vol20/iss3/3